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Logic : Jurnal Rancang Bangun Dan Teknologi
Published by Politeknik Negeri Bali
ISSN : 1412114X     EISSN : 25805649     DOI : https://doi.org/10.31940/logic.v21i3
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Logic : Jurnal Rancang Bangun dan Teknologi is a peer-reviewed research journal published by Unit Publikasi Ilmiah, Pusat Penelitian dan Pengabdian Masyarakat, Politeknik Negeri Bali, aiming at promoting and publishing original high quality research in all disciplines of engineering and applied technology. All research articles submitted to Logic should be original in nature, never previously published in any journal or presented in a conference or undergoing such process across the world. All the submissions will be peer-reviewed by the panel of experts associated with particular field. Submitted papers should meet the internationally accepted criteria and manuscripts should follow the style of the journal for the purpose of both reviewing and editing.
Arjuna Subject : Teknik (semua kategori) - Tenik Industri dan Manufaktur
Articles 132 Documents
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EFFECT OF STATIC THERMAL TENSIONING AND PREHEATING ON ANGULAR DISTORTION IN FCAW WELDED SS400 STEEL CORNER JOINTS Susilo, Sugeng Hadi; yudiyanto, eko; Setiawan, Agus; Khambali, Khambali; Suryanto; Alauddin, Falih
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.39-48

Abstract

FCAW welding is an automated welding process that employs a wire roll electrode to melt metal, using flux or powder within the electrode's core for protection. A common issue with FCAW welding is the occurrence of angular distortion and alterations in the length and width dimensions, particularly in thin plate iron materials, due to residual stresses from the welding process. This research aims to assess the impact of static thermal tensioning, preheating, and their combination on angular distortion in SS400 steel corner joints during FCAW welding, considering heat input during welding. True experimental research methodology was employed, with variations in preheating temperatures of 200°C, 250°C, 300°C, static thermal tensioning at 150°C, 200°C, 250°C, transient thermal tensioning at 150°C, 200°C, 250°C, and a reference method with no treatment to determine the welding approach that minimizes angular distortion. The material used was 3mm thick SS400 steel. Data analysis was performed using Minitab 18 software and the One-Way Anova method. The research results indicate a significant influence of static thermal tensioning, preheating, and their combination on angular distortion. The optimal welding methods identified are preheating-static thermal tensioning at 89°55', preheating-transient thermal tensioning at 89°50', static thermal tensioning at 150°C at 89°45', transient thermal tensioning at 150°C at 89°40', and preheating at 200°C at 89°35'.
ENHANCING ESSENTIAL OIL YIELD: UTILIZING INTERNAL CHOPPER IN STEAM DISTILLATION Rajendra, I Made; Ida Ayu Anom Arsani; I Made Sudana; I Gede Nyoman Suta Waisnawa
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 1 (2024): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i1.31-38

Abstract

The objective of this study is to validate a novel method for chopping essential raw materials. To achieve this, we employed a distillation reactor equipped with an internal chopping module to enhance both the quantity and quality of Champaca essential oil production. Our experiments involved three variations of pre-distillation treatment: no chopping, chopping inside the reactor, and chopping outside the reactor. The distilled oil was subsequently analyzed using GC-MS. These three chopping methods resulted in varying amounts of linalool compounds. Unchopped essential materials yielded 6.54% linalool compounds, while internal chopping produced 32.33%, and external chopping resulted in 7.40% linalool compounds. The internal chopping method proved to be the most effective in increasing linalool compound content. Consequently, we can conclude that chopping materials within the distillation reactor during the steam distillation process significantly enhances the main compound's content.
THE EFFECT OF THE ANGLE AND DIMENSIONS OF A CROSS-SECTION SPECIMEN ON THE TORSIONAL STRENGTH OF AISI 1020 SQUARE STEEL SHAFT Bima Cahya Maula Dana; Syamsul; Hangga Wicaksono; Kris Witono
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 1 (2024): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i1.9-16

Abstract

The unknown torsional strength due to the inconsistency of the angles and dimensions of the square cross-section of AISI 1020 steel specimens in the torsion test is the problem encountered. The research method included: preparation of square AISI 1020 steel specimens measuring 6 mm x 6 mm x 160 mm, measurement of 2 diagonal angles of the cross section of the specimen and dimensions of the cross section at 5 observation points along the specimen receiving torsion loads, torsion testing of specimens, analysis of torsion test results data, and drawing conclusions. The results of the study affect the angle and dimensions of the specimen cross-section on the torsional strength of the AISI 1020 steel square shaft which has a greater value at the angles of 89o and 91o than 90o which with an angle of 89o at dimensions of 5.96 mm x 5.96 mm has a torsional strength of 412 MPa, while at an angle of 90o with dimensions of 5.96 mm x 5.96 mm it has a torsional strength of 359 MPa, and for an angle of 91o in dimensions of 5.95 mm x 5.95 mm has a torsional strength of 402 MPa. The average torsional strength is achieved in the range of 351 to 397 MPa, at an angle of 89o the torsional strength increases by 46 MPa or around 13.1 %, and at an angle of 91o the torsional strength increases by 43 MPa or around 12.3%.
EXPERIMENTAL STUDY OF THE UTILIZATION OF PINEAPPLE LEAF FIBER WITH THE ADDITION OF EPOXY RESIN TO THE TENSILE STRENGTH BREAK OF THE CONCRETE Nisumanti, Sartika; Hasanah, Miftahul; Febryandi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.63-68

Abstract

In its development, many new concrete modifications were found, such as lightweight concrete, fiber concrete, polymer concrete, high-strength concrete and ultra-high-strength concrete. Epoxy resin can accelerate the hardening process of concrete because epoxy itself generates heat so that it helps accelerate hardening. In previous studies, the addition of areca nut shell fiber and 0.8% epoxy resin can increase the split tensile strength of concrete. Based on the description above, it is necessary to conduct research on the split tensile strength of concrete that combines a mixture of pineapple leaf fiber and epoxy resin. So this research uses pineapple leaf fiber and epoxy resin. Pineapple leaf fiber and epoxy resin are expected to be strength-enhancing materials that can produce concrete with more optimal split tensile strength.  The purpose of this study was to determine the effect of the addition of epoxy resin and the percentage variation of pineapple leaf fiber on the split tensile strength of concrete and its comparison with normal concrete and to determine the percentage level of the addition of the most optimum pineapple leaf fiber to produce the maximum concrete split tensile strength test value among the planned variations. The method used in this research is experimental. From the results of the average split tensile strength test at 28 days, the epoxy resin variation of 0.8% achieved a strength of 2.87 MPa, the 0.15% variation achieved 2.37 MPa, and the 0.5% variation achieved 2.47 MPa
SIMULATION OF THE INFLUENCE OF FIBER VOLUME FRACTION AND FIBER ORIENTATION ON THE STRENGTH OF POLYESTER COMPOSITE REINFORCED WITH GLASS FIBER IN BENDING STRENGTH Fakhruddin, Muhammad; Mashudi, Imam; Pramita Sari, Nurlia; Widhi Supriyanto, Nicky Suwandhy
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.79-86

Abstract

Fiber-reinforced composites can be classified into two parts, namely short fiber composites and long fiber composites. Long fibers are generally stronger than short fibers. Long fiber (continuous fiber) is more efficient in laying than short fiber but short fiber is easier to lay than long fiber. Fiber length affects the processability of the fiber composite. Judging from the theory, long fibers can transfer the load and stress from the stress point to the other fiber. In this research, we simulated the effects of volume fraction and fiber orientation in glass fiber-reinforced polyester composites on bending strength to examine the effect of each parameter on the mechanical properties of glass fiber composites. The mechanical properties of the composite were tested using the three-point bending and tensile testing methods. The study expects to find variations in mechanical properties with changes in the glass fiber volume fraction and fiber orientation. In this study, it is planned to function in a relevant environment, the components in this study must be able to operate properly and have been well integrated with prototype manufacturing that has been tested as a test tool function. Notably, the pinnacle of the bending test, measuring 170.41 MPa, was achieved at the specific combination of a 0.5 Fiber Volume Fraction and the 0-90o fiber orientation.
THE POTENTIALS OF ULTRASONIC ATOMIZER AUGMENTED THE SEA SALT PRODUCTIONS I Dewa Gede Agus Tri Putra; Putu Wijaya Sunu; Nyoman Sugiartha; I Nyoman Gede Baliarta; I Wayan Temaja
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 1 (2024): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i1.17-23

Abstract

Ultrasonic atomizers can potentially augment the production of sea salt through a process known as ultrasonic nebulization. While the traditional method of sea salt production primarily relies on natural evaporation, ultrasonic atomization can accelerate the evaporation process. The process typically involves the following steps: collection of seawater, evaporation, brine crystallization and then harvesting process of the sea salt. After processing, the sea salt is typically dried and packaged for distribution and sale. In this project, influencing of ultrasonic atomizer in the process a saline water into the brine, before crystallization can be proceeded. The ultrasonic atomization process significantly increases the surface area of the seawater by converting it into fine droplets. Droplets evaporate more efficient due to large surface area of the droplets. According to testing of the research apparatus which had been conducted, an ultrasonic atomization can increase the salinity by brine evaporation or of droplet productivity of sea salt. This result had been shown that this process can be used to increasing the salinity of sea water. For further steps, this technique can potentially augment the production of sea salt.
ASSESSING MUSCULOSKELETAL DISORDERS (MSDS) OF WORKERS OF FIRED CLAY BRICKS INDUSTRY Budiyanto, Tri; Adiyanto, Okka; Ma'ruf, Farid; Haryadi, Hari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 1 (2024): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i1.24-30

Abstract

Ergonomics is important for sustainable development in many fields, including architecture, health, product design, safety, and workplace design. Ergonomic assessments are essential in the workplace to prevent musculoskeletal disorders (MSDs). Currently, Indonesia has a standardized ergonomic assessment, SNI 9011:2021. This assessment standard is widely used to evaluate human posture. This study aims to evaluate the position of a traditional brick-maker in which the posture identification system is based on the SNI 9011:2021. This study employed a cross-sectional design with a sample of workers in conventional brick manufacturing. The primary findings of this study were visual ergonomic assessment for posture identification, identification of ergonomic assessment categories with high risk in brick manufacturing, and the prevalence of nagging pain among workers in the brick moulding and drying process. To reduce occupational ergonomic risk, particularly for brick-making workers, ergonomic intervention is required in the form of additional work aids such as chairs. This has been shown to reduce the evaluation score based on SNI 9011: 2021, thereby reducing the occurrence of musculoskeletal disorders
COMPARATIVE ANALYSIS OF BILL OF QUANTITY STRUCTURE GEDUNG LAYANAN TERPADU RSUD BANGKINANG CITY USING CONVENTIONAL METHOD AND TEKLA STRUCTURE APPLICATION Bayu Baskoro; Zainuri; Shanti Wahyuni Megasari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.69-78

Abstract

In accordance with PUPR Ministerial Regulation No. 22 of 2018, the use of Building Information Modeling (BIM) must be applied to non simple state buildings with criteria for a building area of more than 2000 m2 and more than 2 floors. Gedung Layanan Terpadu RSUD Kota Bangkinang has an area of 5,040 m2 and has 4 floors but the calculations still use conventional methods. The aim of this study was to analyze the comparison of the bill of quantity (BOQ) of the Gedung Layanan Terpadu RSUD Bangkinang City using conventional methods and the Tekla Structure application. The integrated services building consists of 4 floors, starting from the basement floor, 1st floor, 2nd floor, 3rd floor and roof floor. The research method used was to carry out manual calculations using Microsoft Excel based on the working plans and modeling the building structure using the Tekla Structure application. From the results of the study it can be concluded that the volume of concrete using the conventional method was 3,193.5 m3 while the calculation using the Tekla Structure application was obtained 3,175.5 m3 where there was a difference of 18 m3 or in a percentage of 0,56 % less than the conventional method. For iron volume, there is a difference in iron volume of 2,687.23 kg or 0,45 % less using the Tekla Structure application compared to conventional methods. The conclusion from this study is that the calculation of the bill of quantity using the conventional method is greater than using the Tekla Structure application.
Fatigue Test of Plastics and Manufacturing Collet Nut Driver for Integrated Rotating Bending Fatigue Test Machine Tri Setyo Aji Cahyono; Hadi, Syamsul; Rico Wahyu Pratama; Zakiyah Amalia; Fica Aida Nadhifatul Aini; Kadir, Aini Zuhra Binti Abdul
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.110-116

Abstract

The unknown fatigue life of injection molded plastic materials and the ineffectiveness of clamping both ends of the specimen in the collet of the Integrated Rotary Bending Fatigue Testing Machine with manual tightening and loosening are the obstacles faced. The purpose of testing and making a collet nut driver is to obtain a prediction of the fatigue life of injection molded plastic materials and to increase the effectiveness of clamping the end of the specimen with the help of a DC motor drive. The research method uses experiments which include injection molding of plastic materials of the type Polypropylene (PP) and Acrylonitrile Butadiene Styrene (ABS), checking the straightness and surface finishing of the specimen, fatigue testing at 1800, 2000, 2200 rpm, analysis of fatigue test results, and design-manufacturing collet nut drive with DC motor drive and transmission of a pair of spiral cone gears, manufacture of DC motor sliding movement mechanism along the reach of both ends of the specimen, installation of electric power circuits for direction and electric current switches for clockwise and counterclockwise rotation functions, and analysis of the results of the fatigue test and performance of the collet nut driver The results of fatigue testing at a bending stress (S) of 68 MPa for PP material show that at 1800 rpm, the fatigue life (N) was obtained at 2,014,605 cycles and at 2200 rpm, N was obtained at 1,506,486 cycles. Meanwhile, for ABS specimens, at 1800 rpm, N was obtained at 1,547,106 cycles and at 2200 rpm, N was obtained at 1,190,425 cycles, which means PP material has a longer fatigue life compared to ABS. The test results of the DC motor drive on the collet nut showed that the duration of tightening/loosening was 4.4 times faster than manually, which originally had a duration of 66 seconds, down to just 15 seconds for the DC motor drive.
Analysis of Leakage Test Results on Flange-Gasket Piping System Simulator Device Hadi, Syamsul; Hutagalung, Muhammad Naufal Abiyyi; Pranoto, Bayu; Dwiyanto, Firman; Kurniawan, Dadang
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.27-34

Abstract

Fluid leaks in piping installations often occur in the industrial sector which is detrimental due to the selection of gasket materials, flanges, and improper tightening torque of flange bolts. The fluids that are flowed can be clean water, palm oil with a fatty acid content at an acidity level (pH) of around 4, oil, solutions with a certain pH or fuel. The purpose of the simulator device analysis is to obtain data on the level of tightening torque of bolts-nuts on 1 inch pipe flanges-gaskets and the volume of leakage. The analysis method includes setting the working pressure of the fluid on the globe valve at 1 Bar, 1.3 Bar, and 1.5 Bar on the flange-gasket piping system simulator device, measuring the lowest tightening torque at which the fluid starts to leak to the highest at a condition where there is no leak at all, and two-way Anova analysis on the distribution data. The results of the study showed that the lowest bolt-nut tightening torque at 2 Nm for three M8 bolts-nuts as flange-gasket pair locks resulted in an average fluid droplet leakage of 120 ml/hour and at a torque of 4 Nm the leakage level was about a quarter of that, namely 36 ml/hour and finally at a torque of 5 Nm there was no leakage at all. Implications in industries that use fluid flow with sufficient tightening torque of nuts-bolts on flanges-gaskets can reduce-stop losses due to leakage that occurs in their piping systems.

Page 10 of 14 | Total Record : 132

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